The present optically thick and radiation-pressure dominant shock models show some of the characteristic features of Ultraluminous X-ray sources (ULXs). ULXs are X-ray sources with X-ray luminosity above the Eddington limit for stellar-mass or below the Eddington limit for intermediate-mass black
holes but not supermassive black holes [1]}, [2]}, [3]},
although the recent discovery of coherent pulsations in ULXs support
neutron stars as host [4]}.
A super-Eddington accretion model onto a stellar-mass
black hole whose luminosity far exceeds the Eddington luminosity was proposed by
[5]}. The key features of the super-Eddington accretion are strong optically thick wind and collimated radiation.
